Spectral Anomalies At Wave-Front Dislocations
In a recent Letter, Gbur, Visser, and Wolf [Phys. Rev. Lett. 88, 013901 (2002)] predict that remarkable spectral changes can take place in the neighborhood of phase singularities of a diffracted focused wave. We report here the experimental observation of this anomalous spectral behavior and show that this is a general characteristic of optical vortices. Using a high-resolution interferometric technique, we are able to measure directly both the spectral intensity distribution and the spectral phase at the singular points of optical waves. © 2002 The American Physical Society.
Physical Review Letters
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Popescu, G. and Dogariu, A., "Spectral Anomalies At Wave-Front Dislocations" (2002). Scopus Export 2000s. 2661.